Refrigerating machine



Nov. 20, 1928. 1,692,053

' G. ROS

REFRI GERAT ING MACHI NE Filed March 20, 1926 Patented Nov.` 20, 1928.

UNITED STATES GUNNAR ROOS, 0F STOCIHIOL'M, SWEDEN.

REFRIGERATING MACHINE.

y'Applicatien led March 20, 1926, Serial No. 961,198, and in Sweden March 28, 1925.

The present invention belongs to that class of refrigerating machines which are based upon the absorption process. The noveltyaccording to the invention consists in arrangements for causing an effective circulation of the solution as well as a sufhcient evaporation and absorption. y

An arrangement of the invention is shown diagrammatically in the accompanying drawing.

In the ligure there is shown a generator or still l, from which issues a pipe 3 surrounded by a cooling pipe 4, the still being provided at the bottom thereof with a pipe 9 for the liquid. I n the lower part of the generator or still there is arranged a chamber 5. In this chamberthe lower end of one or more pipes 6 are arranged, the upper ends ,of` which are curved and open above the uppermost of a plurality of perforated cupshaped shelves 27, which are arranged above the liquid level a in the upper part of the generator 1. Similar shelves also are arranged on the walls of the upper part of' chamber 5 above the uppermost shelf extends a pipe 8 cont-rolled by a valve 7. The chamber 5 may, if desired, be placed outside the generator l, without affecting the mode of operation. Furthermore the valve 7 may, if it is found desirable, be placed in such a manner that itis surrounded by or is within the generator 1.

The pipes 3, 8, 9, leadingfrom the generator 1 are connected to a container 2, which serves also as an evaporator and absorber. The pipe 3 opens into the top oi the container 2 in such a manner, and the side walls of the container are provided with suchl arrangements that the liquid entering through the pipe 3 into the upper part ofthe container 2 1s at once spread over the side walls of the container and is caused to run down slowly to the Abottom of the said container. Such arrangements may be carried out in many diierent manners. The arrangement illustrated consists of an open channel 22 at the side walls of the upper part of the container. The pipe 3 opens bottom of whichl is perforated close by the walls of the container. Below this channel the side walls of the container are rovided -with channel shaped shelves 23, whic extend spirally down to the container. shelves, which are other, may be used.

Instead of these channels,

disilaced one below the Whicheverl arrangement the chamber 5.v From the above the said channel, the

the. vicinity of the bottom of is used, there must be an intimate connection of the arrangement to the walls of the container. For this reason it is advisable to shape the walls 'of the containerrin such a manner, that the liquid from the pipe 3 is well divided upon the walls and furthermore is delayed, with regard to its downward motion. Such a shape may be obtained by moulding the shelves directly into the sidewalls, whereby is also obtained an increase in the area of the wall, which is of great importance for the transmission of heat from the outside of the walls.

The pipe 9 from the still 1 opens into the container 2 above an arrangement consisting of a number of cupshaped shelves or trays 24 arranged one above the other, the bottoms of these shelves or trays 24 being ,perforated in such a manner that the liquid from the pipe 9 is caused to fall from the one shelf to the next in a rain or spray. The shelves 24 .are supported and spaced apart byvvertical rods 25. The lowermost shelf 26 is not perforated but has a central opening, to which the outlet pipe 8 is connected.

The vertical position of the container 2 in relation to the generator 1 as well as the arrangement 'of the pipe 9 are such, that when the liquid in the generator has the level a, the said liquid without further assistance .may be able to flow by gravity through the pipe 9.

Furthermore the arrangementsI of the container 2,/ the pipe 8, the valve 7 and the cham'-l ber 5 are chosen in such a manner that the liquid level b in the pipe 8 falls at or somewhat above the level e inthe chamber 5. It may be assumed that the machine works with a solution of ammonia in water and that the cooling -j acket 4 and the absorber and evaporator contain some gas or gases, which are not into the container 2,

or only slightly soluble in Water, for instance v in the generator and it also takes place more quickly lthan in the said generator. Thus an excess pressure in the chamber 5 `1s produced,

and the liquid in the said chamber is caused to flow through the pipes 6 tothe upper part i 1 10 of the generator 1, where the liquid -is sprayed on the shelves or trays from which it drops 24 and is collected on the shelf 26, from which the -liquid is drawn away through the pipe 8. As the pressure in the machine at this moment is the same in all parts, the liquid in the pipe 8 flows past the valve 7 into the chamber 5. As the level of the liquid in the chamber, 5 is thus raised, the ends of the pipes 6 are closed and a pressure arises in the chamber 5, closing the valve 7 and forcing the liquid through the pipes 6 up to the upper part of the container as already described..

The expelled gas is condensed into a liquid state in the cooling pipe 3 from which it then passes to the channel 22 in the container 2. Because of its iow through the channel 22 and the channels 23, the liquid is brought into a inely divided state and is evaporated. The gas then is mixed with the air in the container. From this mixture the gas'is absorbed by the-liquid, which is introduced through lthe pipe 9 and passes downwardly through the trays or shelves 24;. By the evaporation of the condensed liquid the walls of the container. are cooled as usual inmachines of this kind. 4As the evaporation as well as the a-bsorption takes place in the container 2, this the liquid cooling agent to be distributed and vaporlzed on the walls of the chamber, and distributing means for the absorption liquid supported 1n spaced relationto the walls of the chamber. p

2. Inl an absorption refrigerating appa-ratus havin the absorber and vaporizer in a common camber, containing an inert gaseous agent, and in which the cooling agent is in'- troduced inv a liquid state, shelves on the walls of the chamber arranged in such a manner as to cause the liquid cooling agent to be distributed and vaporized on the-wall of the chamber, and distributing shelves for the absorption liquid supported in spaced relation to the walls of the chamber. f 3. Thearrangement in absorption refrigerating apparatus recited inf claim 2 whereln the distributing shelves forthe absorption liquid are arranged centrally Within the chamber and spaced therefrom.

In testimony whereof I have signed my name to this specification.

GUNNAR ROOS. 

